Calculate Real Feel,
Wind Chill & Heat Index.
Free weather calculators: NWS wind chill formula, Rothfusz heat index, and Magnus dew point — with the comfort bands and safety notes. No sign-up.
Official NWS Wind Chill Formula
35.74 + 0.6215T - 35.75(V^0.16) + 0.4275T(V^0.16): clinical frostbite risk benchmark.
Steadman Heat Index Formula
Combines air temperature and relative humidity to model human evaporative skin cooling limits.
Dew Point Comfort Band
Under 55°F is crisp and comfortable; 65°F+ feels humid; 70°F+ is oppressive tropical air.
WindChill Tools
Wind Chill Calculator
The NWS wind chill formula with frostbite timelines — skin-heat-loss, honestly framed.
Heat Index Calculator
The NWS Rothfusz heat index with danger bands — what humid heat does to your cooling system.
Dew Point Calculator
The Magnus dew point formula with comfort bands — the humidity number meteorologists trust.
Practical Guides & Best Practices
What Wind Chill Actually Measures (And What It Doesn't)
The boundary-layer physics behind the formula, the frostbite timeline, and the pipes-and-tomatoes exception everyone forgets.
Dew Point vs Relative Humidity: Why the Right Number Wins
RH changes when the sun comes out; dew point tracks actual moisture. The comparison that ends the "which humidity is right" debate.